Reinhold Weber has put together a list of signs (40 in all on his "programming list of shame") that you're a lousy PHP programmer. Here's a sampling:

don't see the need and/or benefits of a good programming IDE like Zend Studio or Eclipse PDT

have never used some form of version control like Subclipse

don't use a consistent methodology

don't use test-driven development

don't return content but echo or print it from your functions or classes

return HTML, not data, strings, or objects.

don't allow intelligent error handling

you think reusable software equals/requires your code to be OOP

Now granted, some of them are a bit more high level than others, but if you're not headed towards a lot of these, you might change paths, hop out of that comfort zone and branch out into the community and the language a little bit more.